Fertilizer for Southern and West Coast States

Was wondering if you could help me out. I'm developing an interactive map where consumers interested in buying fertilizer can click on their state and find local fertilizer tips and product recommendations. I'm unfamiliar with southern and west coast states so that's where I need some help. If you guys could give me any tips on these areas or maybe point me in the right direction that would be awesome. Also, if you know of smaller, local products, let me know about those too and I might feature them.